- atoma, Pupatonia atoma W.F. Ponder, 1965 - (EATONIELLIDAE)
- Atoma, Genus Atoma Bellardi, 1875 (NEOGASTROPODA (unassigned)) (FOSSIL)
- atomaria, Eatonina atomaria (A.W.B. Powell, 1933) - (CINGULOPSIDAE)
- atomaria, Ransoniella atomaria J.F. Gmelin, 1791 - syn of: Notadusta punctata (C. Linnaeus, 1771) - (CYPRAEIDAE)
- atomaria, Crithe atomaria A.A. Gould, 1860 - (CYSTISCIDAE)
- atomaria, Sinoennea atomaria (P. Dautzenberg, 1893) - (DIAPHERIDAE)
- atomaria, Otala atomaria H.C.F. Schumacher, 1817 - syn of: Otala punctata (O.F. Müller, 1774) - (HELICIDAE)
- atomaria, Hydrobia atomaria R.A. Philippi, 1849 - (HYDROBIIDAE)
- atomaria, Cingula atomaria A.A. Gould, 1860 - (RISSOIDAE)
- atomaria, Ennea atomaria P. Dautzenberg, 1893 - syn of: Sinoennea atomaria (P. Dautzenberg, 1893) - (STREPTAXIDAE)
- atomaria, Teinostoma atomaria (C.B. Adams, 1861) - (TORNIDAE)
- atomaria, Cleotrivia atomaria (W.H. Dall, 1902) - (TRIVIIDAE)
- atomaria pygmaea, Cleotrivia atomaria pygmaea F.A. Schilder, 1931 - syn of: Cleotrivia pygmaea (F.A. Schilder, 1931) - (TRIVIIDAE)
- atomarium, Glabrocingulum atomarium (B. Phillips, 1836 †) - (GOSSELETINIDAE) (FOSSIL)
- atomarius, Ptychomphalus atomarius B. Phillips, 1836 † - syn of: Glabrocingulum atomarium (B. Phillips, 1836 †) - (PTYCHOMPHALIDAE) (FOSSIL)
- atomata, Hedleyella atomata (J.E. Gray, 1834) - (CARYODIDAE)
- atomata kershawi, Hedleyella atomata kershawi J.W. Brazier, 1872 - syn of: Pygmipanda kershawi (J.W. Brazier, 1872) - (CARYODIDAE)
- atomella, Columbella atomella P.L. Duclos, 1835 - syn of: Zafra pumila (R.W. Dunker, 1858) - (COLUMBELLIDAE)
- Atomiscala, Genus Atomiscala De Boury, 1909 (TOFANELLIDAE)
- Atomoceras, Genus Atomoceras Zhuravleva, 1974 (ONCOCERIDA (unassigned)) (FOSSIL)
- Atomodesma, Genus Atomodesma Beyrich, 1865 (ATOMODESMATIDAE) (FOSSIL)
- ATOMODESMATIDAE Waterhouse, 1976 - Family (BIVALVIA-PTERIOMORPHIA-MYALINIDA) (FOSSIL)
- atomus, Bythinella atomus (A. Brongniart, 1810 †) - (BYTHINELLIDAE) (FOSSIL)
- atomus, Homalopoma atomus W.H. Turton, 1932 - (COLLONIIDAE)
- atomus, Condylocardia atomus (G.P. Deshayes, 1858 †) - (CONDYLOCARDIIDAE) (FOSSIL)
- atomus, Plesiocystiscus atomus (E.A. Smith, 1890) - (CYSTISCIDAE)
- atomus, Epitonium atomus (E.A. Smith, 1890) - (EPITONIIDAE)
- atomus, Stoastoma atomus H.A. Pilsbry, 1930 - (HELICINIDAE)
- atomus, Liotia atomus A. Issel, 1869 - (LIOTIIDAE)
- atomus, Omalogyra atomus (R.A. Philippi, 1841) - (OMALOGYRIDAE)
- atomus, Martesia atomus J.B.G.M. Bory De Saint-Vincent, 1827 - syn of: Martesia striata (C. Linnaeus, 1758) - (PHOLADIDAE)
- atomus, Pleurotomaria atomus Keyserling, 1854 † - (PLEUROTOMARIIDAE) (FOSSIL)
- atomus, Punctum atomus H.A. Pilsbry & Y. Hirase, 1904 - (PUNCTIDAE)
- atomus, Rissoa atomus E.A. Smith, 1890 - (RISSOIDAE)
- atomus, Rissoa atomus H.H. Suter, 1908 - syn of: Eatonina subflavescens (T. Iredale, 1915) - (RISSOIDAE)
- atomus, Ganesa atomus H.A. Pilsbry & A.A. Olsson - (SKENEIDAE)
- atomus, Triphora atomus A. Issel, 1869 - (TRIPHORIDAE)
- atomus, Truncatella atomus R.A. Philippi, 1841 - syn of: Omalogyra atomus (R.A. Philippi, 1841) - (TRUNCATELLIDAE)
- atomus, Truncatellina atomus (R.J. Shuttleworth, 1852) - (VERTIGINIDAE)
- atomus burdwoodiana, Omalogyra atomus burdwoodiana H. Strebel, 1908 - syn of: Omalogyra burdwoodiana H. Strebel, 1908 - (OMALOGYRIDAE)
- atomus fasciata, Omalogyra atomus fasciata T.A. de M. Monterosato, 1877 - syn of: Omalogyra atomus (R.A. Philippi, 1841) - (OMALOGYRIDAE)
- atomus maculata, Omalogyra atomus maculata T.A. de M. Monterosato - (OMALOGYRIDAE)
- atomus nautiliformis, Omalogyra atomus nautiliformis A. De Gregorio, 1889 - (OMALOGYRIDAE)
- atomus ornata, Omalogyra atomus ornata P. Dautzenberg, 1889 - (OMALOGYRIDAE)
- atomus polyzona, Omalogyra atomus polyzona . Brusina, 1872 - (OMALOGYRIDAE)
- atomus polyzona, Omalogyra atomus polyzona M.E.J. Bucquoy, P. Dautzenberg & G.F. Dollfus, 1884 - syn of: Omalogyra simplex (O.G. Costa, 1861) - (OMALOGYRIDAE)
- atomus vitrea, Omalogyra atomus vitrea J.G. Jeffreys, 1867 - syn of: Omalogyra atomus (R.A. Philippi, 1841) - (OMALOGYRIDAE)
- atonia, Mangelia atonia (W.H. Dall, 1881) - (MANGELIIDAE)
- atonolena, Aegopinella atonolena É.A.A. Locard, 1894 - syn of: Aegopinella nitens (A. Michaud, 1831) - (ZONITIDAE)
- atopa, Chromodoris atopa L.S.R. Bergh, 1905 - syn of: Ceratosoma amoenum (T.F. Cheeseman, 1886) - (CHROMODORIDIDAE)
- atopa, Glossodoris atopa L.S.R. Bergh, 1905 - syn of: Ceratosoma amoenum (T.F. Cheeseman, 1886) - (CHROMODORIDIDAE)
- Atopa, syn of: Genus Corilla H. Adams & A. Adams, 1855 (CORILLIDAE)
- Atopippeutis, Genus Atopippeutis Kadolsky, 2015 (PLANORBIDAE) (FOSSIL)
- Atopobeloceras, syn of: Genus Mesobeloceras Glenister , 1958 (BELOCERATIDAE) (FOSSIL)
- Atopoceras, syn of: Genus Heteroceras D'Orbigny , 1849 (HETEROCERATIDAE) (FOSSIL)
- Atopochochlis, syn of: Genus Atopocochlis J.C.H. Crosse & P. Fischer, 1888 (ACHATINIDAE)
- Atopocochlis, Genus Atopocochlis J.C.H. Crosse & P. Fischer, 1888 (ACHATINIDAE)
- atopodonta, Admetula atopodonta (R.E. Petit & M.G. Harasewych, 1986) - (CANCELLARIIDAE)
- atopodonta, Cancellaria atopodonta R.E. Petit & M.G. Harasewych, 1986 - syn of: Admetula atopodonta (R.E. Petit & M.G. Harasewych, 1986) - (CANCELLARIIDAE)
- Atopodonta, Subgenus Callocardia (Atopodonta) A.E.M. Cossmann, 1886 (VENERIDAE)
- Atopomya, Genus Atopomya P.G. Oliver, 2013 (BASTEROTIIDAE)
- Atopos, Genus Atopos H.R. Simroth, 1891 (RATHOUISIIDAE)
- atopum, Pisidium atopum W.P. Woodring, 1982 † - (SPHAERIIDAE) (FOSSIL)
- Atorcula, Genus Atorcula Nutzel, 1998 (PROTORCULIDAE) (FOSSIL)
- atossa, Neilonella atossa (W.H. Dall, 1908) - (NEILONELLIDAE)
- atossa, Odostomia atossa W.H. Dall, 1908 - (PYRAMIDELLIDAE)
- atossa, Tindaria atossa W.H. Dall, 1908 - syn of: Neilonella atossa (W.H. Dall, 1908) - (TINDARIIDAE)
- atoxica, Abyssobela atoxica Y.I. Kantor & A.V. Sysoev, 1986 - (RAPHITOMIDAE)
- Atoxon, Genus Atoxon H.R. Simroth, 1889 (UROCYCLIDAE)
- Atoxonoides, Genus Atoxonoides J.L. van Goethem, 1975 (UROCYCLIDAE)
- atoyacensis, Volutaxis sulciferus atoyacensis (H.B. Baker, 1940) - (SPIRAXIDAE)
- atra, Pseudaustenia atra H.H. Godwin-Austen - (HELICARIONIDAE)
- atra, Stagnicola atra (F. von Schrank, 1803) - (LYMNAEIDAE)
- atra, Mangelia atra F. Nordsieck, 1977 - syn of: Mangelia unifasciata (G.P. Deshayes, 1835) - (MANGELIIDAE)
- atra, Mangelia multilineolata atra M.E.J. Bucquoy, P. Dautzenberg & G.F. Dollfus, 1885 - (MANGELIIDAE)
- atra, Muricopsis atra F. Nordsieck, 1972 - syn of: Muricopsis cristatus (G.B. Brocchi, 1814) - (MURICIDAE)
- atra, Aulacomya atra (J.I. Molina, 1782) - (MYTILIDAE)
- atra, Nerita atra J.F. Gmelin, 1791 - (NERITIDAE)
- atra, Ancilla atra P. Dautzenberg, 1902 - syn of: Anolacia mauritiana (G.B. I Sowerby, 1830) - (OLIVIDAE)
- atra, Scaphis atra (R.P. Lesson, 1831) - (ONCHIDIIDAE)
- atra, Doryssa atra (R.A. Philippi, 1848) - (PACHYCHILIDAE)
- atra, Supplanaxis atra W.H. Pease, 1869 - syn of: Supplanaxis niger (J.R.C. Quoy & J.P. Gaimard, 1833) - (PLANAXIDAE)
- atra, Protaeolidiella atra K. Baba, 1955 - (PLEUROLIDIIDAE)
- atra, Polycera atra F.M. MacFarland, 1905 - (POLYCERIDAE)
- atra, Phelopteria atra (Coquand, 1862 †) - (PTERIIDAE) (FOSSIL)
- atra, Raphitoma purpurea atra (M.E.J. Bucquoy, P. Dautzenberg & G.F. Dollfus, 1883) - (RAPHITOMIDAE)
- atra, Siphonaria atra J.R.C. Quoy & J.P. Gaimard, 1833 - (SIPHONARIIDAE)
- atra, Tegula atra (R.P. Lesson, 1830) - (TEGULIDAE)
- atra, Anodonta atra C.S. Rafinesque, 1820 - syn of: Anodonta cataracta T. Say, 1817 - (UNIONIDAE)
- atra, Ventricochis atra C. de la Torre & P. Bartsch, 1972 - (UROCOPTIDAE)
- atra, Paludina atra G.J. De Cristofori & G. Jan, 1832 - (VIVIPARIDAE)
- atra crenata, Aulacomya atra crenata (J.B.P.A. Lamarck, 1819) - (MYTILIDAE)
- atra maoriana, Aulacomya atra maoriana T. Iredale, 1915 - syn of: Aulacomya maoriana T. Iredale, 1915 - (MYTILIDAE)
- atra starobogatovi, Stagnicola atra starobogatovi E.P. Lazareva, 1967 - (LYMNAEIDAE)
- atra zebrella, Stagnicola atra zebrella (W. Dybowski, 1913) - syn of: Stagnicola zebrella (W. Dybowski, 1913) - (LYMNAEIDAE)
- atracta, Acmaea atracta P.P. Carpenter, 1857 - syn of: Lottia atrata (P.P. Carpenter, 1857) - (ACMAEIDAE)
- atracta, Granaria frumentum atracta (H.A. Pilsbry, 1918) - (CHONDRINIDAE)
- atracta, Columbinia atracta H.A. Pilsbry, 1949 - (CLAUSILIIDAE)
- atracta, Alaginella atracta (J.R. le B. Tomlin, 1918) - (MARGINELLIDAE)
- Atractites, Genus Atractites Quenstedt, 1845 (XIPHOTEUTHIDIDAE) (FOSSIL)
- atractodeum, Buccinum atractodeum É.A.A. Locard, 1886 - syn of: Buccinum humphreysianum I. Bennet, 1825 - (BUCCINIDAE)
- Atractodon, Genus Atractodon E. Charlesworth, 1837 (BUCCINIDAE) (FOSSIL)
- atractoides, Monocuphus atractoides (Eudes-Deslongchamps, 1843 †) - (APORRHAIDAE) (FOSSIL)
- atractoides, Bathytoma atractoides (R.B. Watson, 1881) - (BORSONIIDAE)
- atractoides, Agathylla atractoides O. Böttger, 1877 - syn of: Agathylla sulcosa (J.A. Wagner, 1829) - (CLAUSILIIDAE)
- atractoides, Daphnella atractoides R.P.J. Hervier, 1897 - (RAPHITOMIDAE)
- atractoides aethiopica, Bathytoma atractoides aethiopica (E.C. Von Martens & K.H.J. Thiele, 1903) - (BORSONIIDAE)
- atractoides boholica, Bathytoma atractoides boholica M. Parth, 1994 - syn of: Bathytoma boholica M. Parth, 1994 - (BORSONIIDAE)
- atractoides obsolescens, Bathytoma atractoides obsolescens (E.C. Von Martens & K.H.J. Thiele, 1903) - (BORSONIIDAE)
- Atractophaedusa, Subgenus Oospira (Atractophaedusa) P. Ehrmann, 1927 (CLAUSILIIDAE)
- Atractostoma, Genus Atractostoma Sayn, 1932 (POTAMIDIDAE) (FOSSIL)
- Atractotrema, Genus Atractotrema A.E.M. Cossmann, 1888 (FISSURELLIDAE)
- Atractus, syn of: Genus Colus P.F. Rφding, 1798 (BUCCINIDAE)
- atractus, Conus atractus J.R. le B. Tomlin, 1937 - syn of: Conus compressus G.B. II Sowerby, 1866 - (CONIDAE)
- Atracura, Genus Atracura Hornύ, 1964 (CLISOSPIRIDAE) (FOSSIL)
- atraktoides, Busycon atraktoides Gardner, 1947 † - (BUSYCONIDAE) (FOSSIL)
- atraktoides, Narona atraktoides (J. Gardner, 1937 †) - (CANCELLARIIDAE) (FOSSIL)
- Atraktus, Genus Atraktus Gardner, 1937 (VOLUTIDAE) (FOSSIL)
- atramentaria, Anachis atramentaria (G.B. II Sowerby, 1844) - (COLUMBELLIDAE)
- atramentaria, Sultana atramentaria (L. Pfeiffer, 1855) - (ORTHALICIDAE)
- atramentaria, Victaphanta atramentaria (R.J. Shuttleworth, 1853) - (RHYTIDIDAE)
- atramentarium, Bittium atramentarium J.C. Melvill & R. Standen, 1901 - (CERITHIIDAE)
- atramentosa, Lovellona atramentosa (L.A. Reeve, 1849) - (MITROMORPHIDAE)
- atramentosa, Nacella atramentosa L.A. Reeve, 1854 - (NACELLIDAE)
- atramentosa, Nerita atramentosa E.A. Smith, 1884 - (NERITIDAE)
- atramentosa, Lisanerita atramentosa L.A. Reeve, 1855 - syn of: Nerita atramentosa E.A. Smith, 1884 - (NERITIDAE)
- atramentosa, Pilsbryspira atramentosa (E.A. Smith, 1882) - (PSEUDOMELATOMIDAE)
- atramentosa, Pleurotoma atramentosa E.A. Smith, 1882 - syn of: Pilsbryspira atramentosa (E.A. Smith, 1882) - (TURRIDAE)
- atramentosus, Conus atramentosus L.A. Reeve, 1849 - syn of: Lovellona atramentosa (L.A. Reeve, 1849) - (CONIDAE)
- atramontana, Georissa atramontana J. Stanisic, 2010 - (HYDROCENIDAE)
- atrasolea, Crepidula atrasolea R. Collin, 2000 - (CALYPTRAEIDAE)
- atrata, Acmaea atrata P.P. Carpenter, 1857 - syn of: Lottia atrata (P.P. Carpenter, 1857) - (ACMAEIDAE)
- atrata, Acteocina atrata P.S. Mikkelsen & P.M. Mikkelsen, 1984 - (ACTEOCINIDAE)
- atrata, Angaria delphinus atrata (L.A. Reeve, 1843) - (ANGARIIDAE)
- atrata, Marshallopsis atrata A. Cecalupo & I. Perugia, 2012 - (CERITHIOPSIDAE)
- atrata, Tonicia atrata (G.B. II Sowerby, 1840) - (CHITONIDAE)
- atrata, Tonicia atrata F.W. Hutton, 1880 - syn of: Plaxiphora aurata (J.J.N.A. Spalowsky, 1795) - (CHITONIDAE)
- atrata, Zafra atrata (A.A. Gould, 1860) - (COLUMBELLIDAE)
- atrata, Pyrene atrata A.A. Gould, 1860 - syn of: Zafra atrata (A.A. Gould, 1860) - (COLUMBELLIDAE)
- atrata, Columbella atrata A.A. Gould, 1860 - syn of: Zafra atrata (A.A. Gould, 1860) - (COLUMBELLIDAE)
- atrata, Staphylaea atrata J.E. Gray, 1825 - syn of: Staphylaea staphylaea (C. Linnaeus, 1758) - (CYPRAEIDAE)
- atrata, Dendrodoris atrata E.F. Kelaart, 1859 - syn of: Dendrodoris fumata (W.P.E.S. Rüppell & F.S. Leuckart, 1830) - (DENDRODORIDIDAE)
- atrata, Rostanga atrata E.F. Kelaart, 1859 - syn of: Dendrodoris fumata (W.P.E.S. Rüppell & F.S. Leuckart, 1830) - (DISCODORIDIDAE)
- atrata, Doris atrata E.F. Kelaart, 1858 - syn of: Dendrodoris fumata (W.P.E.S. Rüppell & F.S. Leuckart, 1830) - (DORIDIDAE)
- atrata, Fissurella atrata L.A. Reeve, 1830 - syn of: Fissurella picta (J.F. Gmelin, 1791) - (FISSURELLIDAE)
- atrata, Echinolittorina atrata (A. Adams, 1852) - (LITTORINIDAE)
- atrata, Littorina atrata A. Adams, 1852 - syn of: Echinolittorina atrata (A. Adams, 1852) - (LITTORINIDAE)
- atrata, Nodilittorina atrata A. Adams, 1852 - syn of: Echinolittorina atrata (A. Adams, 1852) - (LITTORINIDAE)
- atrata, Lottia atrata (P.P. Carpenter, 1857) - (LOTTIIDAE)
- atrata, Nassaria atrata E.A. Smith, 1881 - syn of: Pareuthria powelli W.O. Cernohorsky, 1977 - (NASSARIIDAE)
- atrata, Nerita atrata L.A. Reeve, 1855 † - syn of: Protorcula iranica A. Nützel & al., 2012 † - (NERITIDAE) (FOSSIL)
- atrata, Nerita atrata J.F. Gmelin, 1791 - syn of: Nerita atramentosa E.A. Smith, 1884 - (NERITIDAE)
- atrata, Hiatula atrata (L.A. Reeve, 1857) - (PSAMMOBIIDAE)
- atrata, Sanguinolaria atrata L.A. Reeve, 1857 - syn of: Hiatula atrata (L.A. Reeve, 1857) - (PSAMMOBIIDAE)
- atrata, Nodulia vignalensis atrata C. de la Torre & P. Bartsch, 1972 - (UROCOPTIDAE)
- atratensis, Calacyclotus atratensis P. Bartsch & J.P.E. Morrison, 1942 - (NEOCYCLOTIDAE)
- atratopurpureus, Theodoxus atratopurpureus E.C. Von Martens, 1879 - syn of: Theodoxus fluviatilis (C. Linnaeus, 1758) - (NERITIDAE)
- atratosuturalis, Clausilia atratosuturalis J.F. Mabille - syn of: Clausilia rugosa parvula A.E.J. Férussac, 1807 - (CLAUSILIIDAE)
- atratum, Anthracoceras atratum (A.H.E. Beyrich, 1837 †) - (ANTHRACOCERATIDAE) (FOSSIL)
- atratum, Cerithium atratum (I. von Born, 1778) - (CERITHIIDAE)
- atratum, Herpetopoma atratum (J.F. Gmelin, 1791) - (CHILODONTIDAE)
- atratum, Dentalium atratum R. Tate, 1887 † - (DENTALIIDAE) (FOSSIL)
- atratum, Eogonioloboceras atratum (Librovitch, 1940 †) - (EOGONIOLOBOCERATIDAE) (FOSSIL)
- atratum tenuis, Cerithium atratum tenuis O.A.L. Mörch, 1876 - syn of: Cerithium atratum (I. von Born, 1778) - (CERITHIIDAE)
- atratus, Coniglobus mercatorius atratus (H.A. Pilsbry & J.T. Gulick, 1900) - (CAMAENIDAE)
- atratus, Brevisentis atratus I. Hyman, 2007 - (HELICARIONIDAE)
- atratus, Milax atratus J.F. Mabille, 1868 - syn of: Milax gagates (J.P.R. Draparnaud, 1801) - (MILACIDAE)
- atratus, Murex atratus I. von Born, 1778 - syn of: Cerithium atratum (I. von Born, 1778) - (MURICIDAE)
- atratus, Limnoperna atratus (C.E. Lischke, 1871) - (MYTILIDAE)
- atratus, Oxymelania atratus (H.A. Pilsbry & A. Hinkley, 1910) - (PACHYCHILIDAE)
- atratus, Fossarus atratus (C.B. Adams, 1852) - (PLANAXIDAE)
- atratus, Monophorus atratus (S. Kosuge, 1962) - (TRIPHORIDAE)
- atratus, Phorcus atratus (W. Wood, 1828) - (TROCHIDAE)
- atratus, Trochus atratus W. Wood, 1828 - syn of: Phorcus atratus (W. Wood, 1828) - (TROCHIDAE)
- atratus, Unio atratus G.B. Sowerby, 1839 - syn of: Diplodon chilensis (J.E. Gray, 1852) - (UNIONIDAE)
- atratus ganinas, Pachychilus atratus ganinas H.A. Pilsbry & A. Hinkley, 1910 - syn of: Oxymelania atratus (H.A. Pilsbry & A. Hinkley, 1910) - (PACHYCHILIDAE)
- atratus selvagensis, Phorcus atratus selvagensis F.F. Talavera, 1978 - (TROCHIDAE)
- atratus suprastriatus, Pachychilus atratus suprastriatus H.A. Pilsbry & A. Hinkley, 1910 - syn of: Oxymelania atratus (H.A. Pilsbry & A. Hinkley, 1910) - (PACHYCHILIDAE)
- atratus trappei, Phorcus atratus trappei F. Nordsieck, 1982 - (TROCHIDAE)
- atrella, Eatoniella atrella W.F. Ponder & E.K. Yoo, 1978 - (EATONIELLIDAE)
- atreolineata, Bulla atreolineata J.S. Schröter, 1804 - syn of: Hydatina physis (C. Linnaeus, 1758) - (BULLIDAE)
- Atresius, Genus Atresius Gabb, 1869 (PASKENTANIDAE) (FOSSIL)
- Atreta, Genus Atreta Etallon, 1862 (DIMYIDAE) (FOSSIL)
- atreus, Nuculites atreus Reed † - (MALLETIIDAE) (FOSSIL)
- atreus woolhopensis, Nuculites atreus woolhopensis Reed † - (MALLETIIDAE) (FOSSIL)
- atricallosus, Bulimus atricallosus A.A. Gould, 1843 - syn of: Amphidromus atricallosus (A.A. Gould, 1843) - (BULIMULIDAE)
- atricallosus, Amphidromus atricallosus (A.A. Gould, 1843) - (CAMAENIDAE)
- atricallosus classiarius, Amphidromus atricallosus classiarius C. Sutcharit & S. Panha, 2006 - (CAMAENIDAE)
- atricallosus laidlawi, Amphidromus atricallosus laidlawi G.A. Solem, 1965 - (CAMAENIDAE)
- atricallosus leucoxanthus, Amphidromus atricallosus leucoxanthus (E.C. Von Martens, 1854) - (CAMAENIDAE)
- atricallosus perakensis, Amphidromus atricallosus perakensis H.C. Fulton, 1901 - (CAMAENIDAE)
- atricallosus temasek, Amphidromus atricallosus temasek S.K. Tan, G.L. Chan & S. Panha, 2011 - (CAMAENIDAE)
- atricapilla, Pliconacca atricapilla (Martin, 1884 †) - (NATICIDAE) (FOSSIL)
- atricapillum, Leptopoma atricapillum (G.B. Sowerby, 1843) - (CYCLOPHORIDAE)
- atricatena, Clanculus atricatena J.R. le B. Tomlin, 1921 - (TROCHIDAE)
- atriceps, Luria controversa atriceps F.A. Schilder & M. Schilder, 1938 - (CYPRAEIDAE)
- atricha, Corneola desmoulinsi atricha (A. Bofill, 1915) - (HELICIDAE)
- Atrichoconcha, Subgenus Lepidotrichia (Atrichoconcha) P. Bartsch, 1942 (HELICARIONIDAE)
- Atrichotoxon, Subgenus Trichotoxon (Atrichotoxon) H.R. Simroth, 1910 (UROCYCLIDAE)
- atriformis, Hemisinus atriformis Cooke, 1919 † - (THIARIDAE) (FOSSIL)
- atrimacula, Rissoella atrimacula W.F. Ponder & E.K. Yoo, 1977 - (RISSOELLIDAE)
- Atrimitra, Subgenus Mitra (Atrimitra) Dall, 1918 (MITRIDAE) (FOSSIL)
- Atrimitra, syn of: Genus Mitra J.B.P.A. Lamarck, 1798 (MITRIDAE)
- Atrina, Genus Atrina J.E. Gray, 1847 (PINNIDAE)
- atriola, Chondrothyretes shuttleworthi atriola (C. de la Torre & P. Bartsch, 1938) - (POMATIIDAE)
- atriolonga, Genitoconia atriolonga L. Salvini-Plawén, 1967 - (GYMNOMENIIDAE)
- atrior, Pilsbryspira atrior C.B. Adams, 1852 - syn of: Pilsbryspira aterrima (G.B. I Sowerby, 1834) - (PSEUDOMELATOMIDAE)
- atripunctatus, Arion atripunctatus F. Dumont & L.L.G. de Mortillet, 1857 - (ARIONIDAE)
- atrisaxi, Megastomia atrisaxi (E. Saurin, 1959) - (PYRAMIDELLIDAE)
- atristoma, Chondrothyra atristoma C. de la Torre & P. Bartsch, 1938 - (POMATIIDAE)
- atristoma luctifera, Chondrothyra atristoma luctifera C. de la Torre & P. Bartsch, 1938 - (POMATIIDAE)
- atristoma umbrata, Chondrothyra atristoma umbrata C. de la Torre & P. Bartsch, 1938 - (POMATIIDAE)
- atriticus, Viviparus atriticus M. von Neumayr, 1869 † - (VIVIPARIDAE) (FOSSIL)
- atrocincta, Helix atrocincta J.R. Bourguignat, 1883 - syn of: Helix lucorum C. Linnaeus, 1758 - (HELICIDAE)
- atrocyanea, Natica atrocyanea R.A. Philippi, 1845 - syn of: Natica limbata d'Orbigny, 1837 - (NATICIDAE)
- atrocyanea, Natica atrocyanea R.A. Philippi, 1845 - syn of: Natica limbata d'Orbigny, 1837 - (NATICIDAE)
- atroflava, Amastra mucronata atroflava A. Hyatt & H.A. Pilsbry, 1911 - (AMASTRIDAE)
- atrofusca, Planispira atrofusca L. Pfeiffer, 1861 - (CAMAENIDAE)
- atrofusca, Tritonia atrofusca W. Macgillivray, 1843 - syn of: Tritonia hombergii G.L.C.F.D. Cuvier, 1803 - (TRITONIIDAE)
- atrogriseata, Acanthodoris atrogriseata O'Donoghue, 1927 - (ONCHIDORIDIDAE)
- atrolabiata, Caucasotachea atrolabiata (I. Krynicki, 1833) - (HELICIDAE)
- atrolabiata, Helix atrolabiata I. Krynicki, 1833 - syn of: Caucasotachea atrolabiata (I. Krynicki, 1833) - (HELICIDAE)
- atrolabiata decussata, Helix atrolabiata decussata O. Böttger, 1881 - syn of: Caucasotachea atrolabiata (I. Krynicki, 1833) - (HELICIDAE)
- atrolabiata intercedens, Helix atrolabiata intercedens O. von Retowski, 1889 - syn of: Caucasotachea calligera (F. Dubois De Montpéreux, 1840) - (HELICIDAE)
- atrolabiata lencoranea, Helix atrolabiata lencoranea A. Mousson, 1863 - syn of: Caucasotachea lencoranea (A. Mousson, 1863) - (HELICIDAE)
- atrolabiata maculatofasciata, Helix atrolabiata maculatofasciata O. Böttger, 1881 - syn of: Caucasotachea atrolabiata (I. Krynicki, 1833) - (HELICIDAE)
- atrolabiata marginata, Caucasotachea atrolabiata marginata (A. Schmidt, 1865) - (HELICIDAE)
- atrolabiata nemoraloides, Helix atrolabiata nemoraloides W. Kobelt, 1903 - syn of: Caucasotachea calligera (F. Dubois De Montpéreux, 1840) - (HELICIDAE)
- atrolabiata stauropolitana, Caucasotachea atrolabiata stauropolitana A. Schmidt, 1854 - syn of: Caucasotachea atrolabiata (I. Krynicki, 1833) - (HELICIDAE)
- atrolabiata tricolor, Helix atrolabiata tricolor O. Böttger, 1881 - syn of: Caucasotachea atrolabiata (I. Krynicki, 1833) - (HELICIDAE)
- atrolineata, Bulla atrolineata J.S. Schröter, 1804 - syn of: Hydatina physis (C. Linnaeus, 1758) - (BULLIDAE)
- atromaculata, Dendrodoris atromaculata (J. Alder & A. Hancock, 1864) - (DENDRODORIDIDAE)
- atromaculata, Peltodoris atromaculata L.S.R. Bergh, 1880 - (DISCODORIDIDAE)
- atromaculatus, Zonitarion atromaculatus G.A. de Mol, 1970 - (UROCYCLIDAE)
- atromarginata, Aplysia atromarginata L.S.R. Bergh, 1905 - syn of: Aplysia parvula O.A.L. Mörch, 1863 - (APLYSIIDAE)
- atromarginata, Doriprismatica atromarginata (G.L.C.F.D. Cuvier, 1804) - (CHROMODORIDIDAE)
- atromarginata, Glossodoris atromarginata G.L.C.F.D. Cuvier, 1804 - syn of: Doriprismatica atromarginata (G.L.C.F.D. Cuvier, 1804) - (CHROMODORIDIDAE)
- atromarginata, Discodoris atromarginata (L.S.R. Bergh, 1880) - (DISCODORIDIDAE)
- atromarginata, Doris atromarginata G.L.C.F.D. Cuvier, 1804 - syn of: Doriprismatica atromarginata (G.L.C.F.D. Cuvier, 1804) - (DORIDIDAE)
- atromarginata, Goniodoris atromarginata G.L.C.F.D. Cuvier, 1804 - syn of: Doriprismatica atromarginata (G.L.C.F.D. Cuvier, 1804) - (GONIODORIDIDAE)
- atromarginatum, Cerithium atromarginatum P. Dautzenberg & J.L. Bouge, 1933 - (CERITHIIDAE)
- atromarginatus, Unio atromarginatus I. Lea, 1840 - syn of: Elliptoideus sloatianus (I. Lea, 1840) - (UNIONIDAE)
- atrophius, Planorbarius atrophius P. Jodot, 1958 - syn of: Planorbarius alcalalensis P. Jodot, 1958 - (PLANORBIDAE)
- atrophum, Gomphoceras atrophum Barrande, 1865 † - syn of: Vespoceras atrophum (Barrande, 1865 †) - (DIESTOCERATIDAE) (FOSSIL)
- atrophum, Vespoceras atrophum (Barrande, 1865 †) - (MANDALOCERATIDAE) (FOSSIL)
- atrophus, Glacidorbis atrophus W.F. Ponder & G.J. Avern, 2000 - (GLACIDORBIDAE)
- atropida, Hydrobia atropida . Brusina, 1892 † - (HYDROBIIDAE) (FOSSIL)
- Atropidina, Subgenus Valvata (Atropidina) W.A. Lindholm, 1906 (VALVATIDAE)
- Atropis, Subgenus Omphalotropis (Atropis) W.H. Pease, 1871 (ASSIMINEIDAE)
- atropos, Ampelita atropos (G.P. Deshayes in A.E.J. Férussac, 1851) - (ACAVIDAE)
- atropos, Dendrodoris atropos L.S.R. Bergh, 1879 - syn of: Dendrodoris fumata (W.P.E.S. Rüppell & F.S. Leuckart, 1830) - (DENDRODORIDIDAE)
- atropurpurea, Clathurella atropurpurea É.A.A. Locard & E. Caziot, 1900 - syn of: Raphitoma atropurpurea (É.A.A. Locard & E. Caziot, 1900) - (CLATHURELLIDAE)
- atropurpurea, Eatoniella atropurpurea (G.R. von Frauenfeld, 1867) - (EATONIELLIDAE)
- atropurpurea, Ocinebrina interfossa atropurpurea (P.P. Carpenter, 1865) - (MURICIDAE)
- atropurpurea, Nerita atropurpurea C.A. Récluz, 1841 - syn of: Nerita planospira H.E. Anton, 1839 - (NERITIDAE)
- atropurpurea, Pinna atropurpurea G.B. I Sowerby, 1825 - syn of: Pinna bicolor J.F. Gmelin, 1791 - (PINNIDAE)
- atropurpurea, Avicula atropurpurea R.W. Dunker, 1872 - syn of: Pinctada albina (J.B.P.A. Lamarck, 1819) - (PTERIIDAE)
- atropurpurea, Pinctada atropurpurea R.W. Dunker, 1852 - syn of: Pinctada albina (J.B.P.A. Lamarck, 1819) - (PTERIIDAE)
- atropurpurea, Raphitoma atropurpurea (É.A.A. Locard & E. Caziot, 1900) - (RAPHITOMIDAE)
- atropurpurea, Alasmidonta atropurpurea C.S. Rafinesque, 1831 - (UNIONIDAE)
- atropurpurea, Ventricochis atropurpurea (R. Arango, 1882) - (UROCOPTIDAE)
- atropurpurea encinarensis, Ventricochis atropurpurea encinarensis C. de la Torre & P. Bartsch, 1972 - (UROCOPTIDAE)
- atropurpurea rinconadensis, Ventricochis atropurpurea rinconadensis C. de la Torre & P. Bartsch, 1972 - (UROCOPTIDAE)
- atropurpurea rinconadoensis, Ventricochis atropurpurea rinconadoensis C. de la Torre & P. Bartsch, 1972 - syn of: Ventricochis atropurpurea rinconadensis C. de la Torre & P. Bartsch, 1972 - (UROCOPTIDAE)
- atropurpureus, Musculus atropurpureus R.W. Dunker, 1857 - syn of: Musculus niger Gray, 1824 - (MYTILIDAE)
- atropurpureus, Clanculus atropurpureus Gould, 1849 - (TROCHIDAE)
- atrosetosum, Cyathopoma atrosetosum (R.H. Beddome, 1875) - (CYCLOPHORIDAE)
- atrostyla, Kurtziella atrostyla (G.W. Tryon, 1884) - (MANGELIIDAE)
- atrosuturalis, Clausilia atrosuturalis J.R. Bourguignat, 1877 - syn of: Clausilia rugosa parvula A.E.J. Férussac, 1807 - (CLAUSILIIDAE)
- atrotuberculata, Hallaxa atrotuberculata T.M. Gosliner & S. Johnson, 1994 - (ACTINOCYCLIDAE)
- atrouenze, Subdoloceras atrouenze Kröger, 2008 † - syn of: Subdoloceras atrouzense Kröger, 2008 † - (PSEUDORTHOCERATIDAE) (FOSSIL)
- atrousensis, Parafidelites atrousensis Klug, 2002 † - (AGONIATITIDAE) (FOSSIL)
- atrouzense, Subdoloceras atrouzense Kröger, 2008 † - (PSEUDORTHOCERATIDAE) (FOSSIL)
- atroviolacea, Ellipsaria atroviolacea C.S. Rafinesque, 1820 - syn of: Elliptio dilatata C.S. Rafinesque, 1820 - (UNIONIDAE)
- atrovirens, Simpulopsis atrovirens (S. Moricand, 1836) - (SIMPULOPSIDAE)
- atrovirens, Anodonta atrovirens R.A. Philippi, 1848 - syn of: Anodontites inaequivalva (I. Lea, 1868) - (UNIONIDAE)
- atrovirens, Unio atrovirens E.A. Rossmässler, 1836 - syn of: Unio crassus L. Philipsson in A. Retzius, 1788 - (UNIONIDAE)
- atrovirens, Anodonta atrovirens G. Stabile, 1859 - syn of: Anodonta cygnea (C. Linnaeus, 1758) - (UNIONIDAE)
- atroviridis, Doris atroviridis E.F. Kelaart, 1858 - syn of: Dendrodoris nigra (W. Stimpson, 1855) - (DORIDIDAE)
- atroviridis, Elysia atroviridis K. Baba, 1955 - (PLAKOBRANCHIDAE)
- atrum, Buccinum atrum F. von Schrank, 1803 - syn of: Stagnicola atra (F. von Schrank, 1803) - (BUCCINIDAE)
- atrum, Chlorostoma atrum R.P. Lesson, 1830 - syn of: Tegula atra (R.P. Lesson, 1830) - (TEGULIDAE)
- Atsabites, Genus Atsabites Haniel, 1915 (PARAGASTRIOCERATIDAE) (FOSSIL)
- atsharensis, Colchidites atsharensis Rouchadze, 1933 † - (ANCYLOCERATIDAE) (FOSSIL)
- atsunaiensis, Macoma atsunaiensis Honda, 1988 † - (TELLINIDAE) (FOSSIL)
- attalia, Elaeocyma attalia W.H. Dall, 1919 - (DRILLIIDAE)
- attanosa, Cylichna attanosa P.P. Carpenter, 1865 - syn of: Cylichna attonsa P.P. Carpenter, 1865 - (CYLICHNIDAE)
- attava, Diplozone attava J. Perner, 1907 † - (MURCHISONIIDAE) (FOSSIL)
- attava, Quadricarina attava (J. Perner, 1907 †) - (PORCELLIIDAE) (FOSSIL)
- attavum, Salpingostoma attavum J. Perner, 1903 † - (BUCANIIDAE) (FOSSIL)
- attavum, Trochonema attavum J. Perner, 1903 † - (TROCHONEMATIDAE) (FOSSIL)
- attavus, Orthoceras attavus W.C. Brøgger, 1882 † - syn of: Slemmestadoceras attavus (W.C. Brøgger, 1882 †) - (ORTHOCERATIDAE) (FOSSIL)
- attavus, Slemmestadoceras attavus (W.C. Brøgger, 1882 †) - (ORTHOCERIDA (unassigned)) (FOSSIL)
- Attebania, Genus Attebania M. Ghamizi, M. Bodon, Boulal & F.L. Giusti, 1999 (HYDROBIIDAE)
- attegia, Sitala attegia (W.H. Benson, 1859) - (ARIOPHANTIDAE)
- attegia, Helix attegia W.H. Benson - syn of: Sitala attegia (W.H. Benson, 1859) - (HELICIDAE)
- attella biconica, Zemitrella attella biconica H.H. Suter, 1908 - syn of: Zemitrella pseudomarginata (H.H. Suter, 1908) - (COLUMBELLIDAE)
- attella fauroti, Nassarina attella fauroti F.P. Jousseaume, 1888 - syn of: Anachis fauroti (F.P. Jousseaume, 1888) - (COLUMBELLIDAE)
- attella longicauda, Columbella attella longicauda A.E.M. Cossmann, 1901 - syn of: Columbella rustica (C. Linnaeus, 1758) - (COLUMBELLIDAE)
- attemsi, Deroceras attemsi (H.R. Simroth, 1904) - (AGRIOLIMACIDAE)
- attemsi, Montenegrina janinensis attemsi (A.J. Wagner, 1914) - (CLAUSILIIDAE)
- attentia, Canalispira attentia (C.F. Laseron, 1957) - (CYSTISCIDAE)
- attentissima, Miralda attentissima (S. Nomura, 1936) - (PYRAMIDELLIDAE)
- attenuans, Aclis attenuans J.G. Jeffreys, 1883 - (ACLIDIDAE)
- attenuapex, Goniapex attenuapex F.G. Thompson, 1988 - (UROCOPTIDAE)
- attenuata, Partulina terebra attenuata L. Pfeiffer, 1855 - (ACHATINELLIDAE)
- attenuata, Leptachatina attenuata C.M. Cooke, 1911 - (AMASTRIDAE)
- attenuata, Cleionychia attenuata (J.W. Hall, 1847 †) - (AMBONYCHIIDAE) (FOSSIL)
- attenuata, Mytilarca attenuata J.W. Hall & R.P. Whitfield, 1869 † - syn of: Mytilarca chemungensis (T.A. Conrad, 1842 †) - (AMBONYCHIIDAE) (FOSSIL)
- attenuata, Fontigens nickliniana attenuata (S.S. Haldeman, 1841) - (AMNICOLIDAE)
- attenuata, Barbatia attenuata R.W. Dunker, 1869 - syn of: Barbatia parva (G.B. I Sowerby, 1833) - (ARCIDAE)
- attenuata, Phragmolites attenuata J.W. Hall, 1861 † - syn of: Pterotheca attenuata (J.W. Hall, 1861 †) - (BUCANIIDAE) (FOSSIL)
- attenuata, Chauvetia turritellata attenuata T.A. de M. Monterosato, 1884 - (BUCCINIDAE)
- attenuata, Bulla attenuata W.H. Dall, 1892 † - (BULLIDAE) (FOSSIL)
- attenuata, Cerithium lividulum attenuata M.E.J. Bucquoy, P. Dautzenberg & G.F. Dollfus, 1882 - (CERITHIIDAE)
- attenuata, Synthopsis attenuata A. Cecalupo & I. Perugia, 2012 - (CERITHIOPSIDAE)
- attenuata, Seila attenuata C. Hedley, 1900 - (CERITHIOPSIDAE)
- attenuata, Abida attenuata (P. Fagot, 1886) - (CHONDRINIDAE)
- attenuata, Etrema kitcheni attenuata C.F. Laseron, 1954 - (CLATHURELLIDAE)
- attenuata, Pyrostoma attenuata (E.A. Rossmässler, 1835) - (CLAUSILIIDAE)
- attenuata, Zemitrella attenuata A.W.B. Powell, 1940 - (COLUMBELLIDAE)
- attenuata, Columbella attenuata G.F. Angas, 1871 - syn of: Zella beddomei (W.F. Petterd, 1884) - (COLUMBELLIDAE)
- attenuata, Vexillum attenuata W.J. Broderip, 1836 - syn of: Ziba attenuata (W.J. Broderip, 1836) - (COSTELLARIIDAE)
- attenuata, Eucrassatella attenuata F.W. Hutton, 1873 † - syn of: Eucrassatella ampla (C.A. von Zittel, 1863 †) - (CRASSATELLIDAE) (FOSSIL)
- attenuata, Cucullaea attenuata F.W. Hutton, 1873 † - (CUCULLAEIDAE) (FOSSIL)
- attenuata, Cuspidaria attenuata † - (CUSPIDARIIDAE) (FOSSIL)
- attenuata, Cuspidaria attenuata E. Forbes, 1843 - syn of: Cuspidaria rostrata (L. Spengler, 1793) - (CUSPIDARIIDAE)
- attenuata, Cyamiomactra attenuata R.K. Dell, 1956 - syn of: Cyamiomactra problematica F. Bernard, 1897 - (CYAMIIDAE)
- attenuata, Fulgerca attenuata (B. Wade, 1926 †) - (CYSTISCIDAE) (FOSSIL)
- attenuata, Donaldina attenuata (J. Donald, 1898 †) - (DONALDINIDAE) (FOSSIL)
- attenuata, Parviscala attenuata G.B. II Sowerby, 1874 - syn of: Epitonium subauriculatum (S.M. Souverbie, 1866) - (EPITONIIDAE)
- attenuata, Opalia attenuata W.H. Pease, 1860 - syn of: Opalia bicarinata (G.B. II Sowerby, 1844) - (EPITONIIDAE)
- attenuata, Melanella attenuata (G.B. II Sowerby, 1866) - (EULIMIDAE)
- attenuata, Phidiana attenuata J.P.Y. Couthouy in A.A. Gould, 1852 - syn of: Phidiana lottini (R.P. Lesson, 1831) - (FACELINIDAE)
- attenuata, Latirus attenuata L.A. Reeve, 1847 - syn of: Pustulatirus attenuatus (L.A. Reeve, 1847) - (FASCIOLARIIDAE)
- attenuata, Ferussacia attenuata (A. Mousson, 1872) - (FERUSSACIIDAE)
- attenuata, Ludwigella attenuata Buckman, 1901 † - syn of: Graphoceras attenuatus (Buckman, 1901 †) - (GRAPHOCERATIDAE) (FOSSIL)
- attenuata, Laocaia attenuata A.A. Kuzminykh, 1999 - (HELICARIONIDAE)
- attenuata, Panopea attenuata G.B. Sowerby, 1873 - syn of: Panopea glycimeris (I. von Born, 1778) - (HIATELLIDAE)
- attenuata, Hippocardia attenuata T.A. Conrad, 1842 † - syn of: Hoareicardia cuneus (T.A. Conrad, 1840 †) - (HIPPOCARDIIDAE) (FOSSIL)
- attenuata, Laternula attenuata (L.A. Reeve, 1863) - (LATERNULIDAE)
- attenuata, Leptochitonicola attenuata Avdeev & B.I. Sirenko, 2005 - syn of: Leptochiton rugatus (P.P. Carpenter in H.A. Pilsbry, 1892) - (LEPTOCHITONIDAE)
- attenuata, Limatula attenuata W.H. Dall, 1916 - (LIMIDAE)
- attenuata, Loxonema attenuata Lindström, 1884 † - syn of: Morania attenuata (Lindström, 1884 †) - (LOXONEMATIDAE) (FOSSIL)
- attenuata, Lymnaea attenuata T. Say, 1829 - syn of: Ladislavella elodes (T. Say, 1821) - (LYMNAEIDAE)
- attenuata, Lymnaea attenuata C.A. Westerlund, 1877 - syn of: Ladislavella terebra (C.A. Westerlund, 1885) - (LYMNAEIDAE)
- attenuata, Mactra attenuata L.A. Reeve, 1854 - syn of: Mactra cygnus J.F. Gmelin, 1791 - (MACTRIDAE)
- attenuata, Mangelia attenuata (G. Montagu, 1803) - (MANGELIIDAE)
- attenuata, Cythara attenuata G. Montagu, 1803 - syn of: Mangelia attenuata (G. Montagu, 1803) - (MANGELIIDAE)
- attenuata, Volvarina attenuata (L.A. Reeve, 1865) - (MARGINELLIDAE)
- attenuata, Marginella attenuata H.C. Weinkauff, 1879 - syn of: Austroginella translucida (G.B. II Sowerby, 1846) - (MARGINELLIDAE)
- attenuata, Mesoginella attenuata H.C. Weinkauff, 1879 - syn of: Austroginella translucida (G.B. II Sowerby, 1846) - (MARGINELLIDAE)
- attenuata, Melanopsis attenuata (P.M. Pallary, 1920) - (MELANOPSIDAE)
- attenuata, Ziba attenuata (W.J. Broderip, 1836) - (MITRIDAE)
- attenuata, Mitra attenuata L.A. Reeve, 1844 - syn of: Mitra coffea G.H. Schubert & J.A. Wagner, 1829 - (MITRIDAE)
- attenuata, Liromytilus attenuata (J.J.F. Whiteaves, 1894 †) - (MODIOMORPHIDAE) (FOSSIL)
- attenuata, Mysella attenuata R.K. Dell, 1956 - syn of: Cyamiomactra problematica F. Bernard, 1897 - (MONTACUTIDAE)
- attenuata, Morania attenuata (Lindström, 1884 †) - (MURCHISONIIDAE) (FOSSIL)
- attenuata, Calotrophon attenuata W.H. Dall, 1890 - syn of: Calotrophon ostrearum (T.A. Conrad, 1846) - (MURICIDAE)
- attenuata, Purpura attenuata L.A. Reeve, 1846 - syn of: Nucella lima attenuata (L.A. Reeve, 1846) - (MURICIDAE)
- attenuata, Nucella lima attenuata (L.A. Reeve, 1846) - (MURICIDAE)
- attenuata, Solamen attenuata (G.P. Deshayes, 1836) - (MYTILIDAE)
- attenuata, Modiolus attenuata F.B. Meek & Hayden, 1857 † - (MYTILIDAE) (FOSSIL)
- attenuata, Perna attenuata L.A. Reeve, 1858 - syn of: Isognomon isognomum (C. Linnaeus, 1758) - (MYTILIDAE)
- attenuata, Polidevcia attenuata Fleming † - (NUCULANIDAE) (FOSSIL)
- attenuata, Oliva attenuata L.A. Reeve, 1850 - syn of: Olivella semistriata (J.E. Gray, 1839) - (OLIVIDAE)
- attenuata, Hypergonia attenuata (J.W. Hall, 1856 †) - (ORTHONEMIDAE) (FOSSIL)
- attenuata, Ostrea attenuata G.B. II Sowerby, 1871 - syn of: Saccostrea circumsuta (A.A. Gould, 1850) - (OSTREIDAE)
- attenuata, Palaeomutela attenuata Gusev † - (PALAEOMUTELIDAE) (FOSSIL)
- attenuata, Trepsipleura attenuata (Sayre, 1930 †) - (PALAEOSTYLIDAE) (FOSSIL)
- attenuata, Palaeozygopleura attenuata (J.W. Hall, 1859 †) - (PALAEOZYGOPLEURIDAE) (FOSSIL)
- attenuata, Partula attenuata W.H. Pease, 1866 - (PARTULIDAE)
- attenuata, Pholadomya attenuata Hupe, 1854 † - syn of: Pholadomya fidicula Sowerby, 1826 † - (PHOLADOMYIDAE) (FOSSIL)
- attenuata, Pinna attenuata L.A. Reeve, 1858 - (PINNIDAE)
- attenuata, Cyrtopinna attenuata L.A. Reeve, 1859 - syn of: Pinna attenuata L.A. Reeve, 1858 - (PINNIDAE)
- attenuata, Physastra attenuata (G.B. Sowerby, 1874) - (PLANORBIDAE)
- attenuata, Pleurocera attenuata I. Lea - (PLEUROCERIDAE)
- attenuata, Annularops attenuata (C. de la Torre & P. Bartsch, 1941) - (POMATIIDAE)
- attenuata, Pseudoliva attenuata B. Wade, 1926 † - syn of: Fulgerca attenuata (B. Wade, 1926 †) - (PSEUDOLIVIDAE) (FOSSIL)
- attenuata, Cyclozyga attenuata Hoare & Sturgeon, 1978 † - (PSEUDOZYGOPLEURIDAE) (FOSSIL)
- attenuata, Hemizyga attenuata (Hoare & Sturgeon, 1980 †) - (PSEUDOZYGOPLEURIDAE) (FOSSIL)
- attenuata, Gamizyga attenuata Hoare & Sturgeon, 1980 † - syn of: Hemizyga attenuata (Hoare & Sturgeon, 1980 †) - (PSEUDOZYGOPLEURIDAE) (FOSSIL)
- attenuata, Vulsella attenuata L.A. Reeve, 1858 - syn of: Vulsella minor P.F. Röding, 1798 - (PTERIIDAE)
- attenuata, Pterotheca attenuata (J.W. Hall, 1861 †) - (PTEROTHECIDAE) (FOSSIL)
- attenuata, Pterotrigonia aliformis attenuata J. Lycett † - (PTEROTRIGONIIDAE) (FOSSIL)
- attenuata, Notharinia attenuata J.J. Vermeulen, L.C. Phung & Q.T. Truong, 2007 - (PUPINIDAE)
- attenuata, Syrnola attenuata (W.H. Dall, 1892) - (PYRAMIDELLIDAE)
- attenuata, Turbonilla attenuata J.G. Jeffreys, 1884 - syn of: Turbonilla micans (T.A. de M. Monterosato, 1875) - (PYRAMIDELLIDAE)
- attenuata, Odostomia attenuata W.H. Dall, 1892 - syn of: Syrnola attenuata (W.H. Dall, 1892) - (PYRAMIDELLIDAE)
- attenuata, Odostomia acuta attenuata J.T. Marshall, 1896 - (PYRAMIDELLIDAE)
- attenuata, Pseudodaphnella attenuata C. Hedley, 1922 - (RAPHITOMIDAE)
- attenuata, Raphitoma attenuata G. Montagu, 1803 - syn of: Mangelia attenuata (G. Montagu, 1803) - (RAPHITOMIDAE)
- attenuata, Volvulella attenuata (C.B. Adams, 1862) - (RHIZORIDAE)
- Attenuata, Genus Attenuata C. Hedley, 1918 (RISSOIDAE)
- attenuata, Tellina attenuata J.G. Jeffreys, 1864 - syn of: Macoma balthica (C. Linnaeus, 1758) - (TELLINIDAE)
- attenuata, Trochaclis attenuata B.A. Marshall, 1995 - (TROCHACLIDIDAE)
- attenuata, Thalotia attenuata I.H. Jonas, 1844 - syn of: Tosatrochus attenuatus (I.H. Jonas, 1844) - (TROCHIDAE)
- attenuata, Turbinella attenuata L.A. Reeve, 1847 - syn of: Pustulatirus attenuatus (L.A. Reeve, 1847) - (TURBINELLIDAE)
- attenuata, Turritella attenuata L.A. Reeve, 1849 - (TURRITELLIDAE)
- attenuata, Liocallonia attenuata C. de la Torre & P. Bartsch, 1972 - (UROCOPTIDAE)
- attenuata, Meretrix attenuata R.W. Dunker, 1863 - (VENERIDAE)
- attenuata, Venerupis attenuata G.B. II Sowerby, 1854 - syn of: Irus irus (C. Linnaeus, 1758) - (VENERIDAE)
- attenuata, Zygopleura attenuata Sayre, 1930 † - syn of: Trepsipleura attenuata (Sayre, 1930 †) - (ZYGOPLEURIDAE) (FOSSIL)
- attenuata elongata, Volvarina attenuata elongata É.A.A. Locard, 1898 - (MARGINELLIDAE)
- attenuata euzieriana, Pyrostoma attenuata euzieriana (J.R. Bourguignat, 1869) - (CLAUSILIIDAE)
- attenuata flava, Meretrix attenuata flava J. Hornell, 1917 - syn of: Meretrix attenuata R.W. Dunker, 1863 - (VENERIDAE)
- attenuata iriana, Pyrostoma attenuata iriana (C. Pollonera, 1885) - (CLAUSILIIDAE)
- attenuata leia, Pyrostoma attenuata leia J.R. Bourguignat, 1876 - syn of: Pyrostoma mellae leia J.R. Bourguignat, 1876 - (CLAUSILIIDAE)
- attenuata lineolata, Pyrostoma attenuata lineolata (F. Held, 1836) - (CLAUSILIIDAE)
- attenuata mellae, Pyrostoma attenuata mellae G. Stabile, 1864 - syn of: Pyrostoma mellae (G. Stabile, 1864) - (CLAUSILIIDAE)
- attenuata minaensis, Annularops attenuata minaensis (C. de la Torre & P. Bartsch, 1941) - (POMATIIDAE)
- attenuata modulata, Pyrostoma attenuata modulata (A. Schmidt, 1857) - (CLAUSILIIDAE)
- attenuata morsei, Annularops attenuata morsei (C. de la Torre & P. Bartsch, 1941) - (POMATIIDAE)
- attenuata payraudeauti, Mangelia attenuata payraudeauti G.P. Deshayes, 1835 - syn of: Mangelia payraudeauti (G.P. Deshayes, 1835) - (MANGELIIDAE)
- attenuata ripkeni, Pyrostoma attenuata ripkeni G. Falkner, 2000 - syn of: Pyrostoma mellae ripkeni G. Falkner, 2000 - (CLAUSILIIDAE)
- attenuata sabaudina, Pyrostoma attenuata sabaudina (J.R. Bourguignat, 1877) - (CLAUSILIIDAE)
- attenuata tenuistriata, Pyrostoma attenuata tenuistriata (N. Pini, 1879) - (CLAUSILIIDAE)
- attenuatispira, Mendax attenuatispira A.W.B. Powell, 1937 - syn of: Paramendax attenuatispira (A.W.B. Powell, 1937) - (CERITHIOPSIDAE)
- attenuatispira, Paramendax attenuatispira (A.W.B. Powell, 1937) - (NEWTONIELLIDAE)
- attenuatispira, Triforis attenuatispira A.W.B. Powell, 1937 - syn of: Paramendax attenuatispira (A.W.B. Powell, 1937) - (TRIPHORIDAE)
- attenuatum, Adamsoceras attenuatum Flower † - (ACTINOCERIDA (unassigned)) (FOSSIL)
- attenuatum, Caecum attenuatum L. de Folin, 1879 - (CAECIDAE)
- attenuatum, Acrosterigma attenuatum (G.B. II Sowerby, 1841) - (CARDIIDAE)
- attenuatum, Lirobittium attenuatum (P.P. Carpenter, 1864) - (CERITHIIDAE)
- attenuatum, Bittium attenuatum P.P. Carpenter, 1864 - syn of: Lirobittium attenuatum (P.P. Carpenter, 1864) - (CERITHIIDAE)
- attenuatum, Rhinoclavis attenuatum N.H. Odhner, 1917 - syn of: Rhinoclavis articulata (A. Adams & L.A. Reeve, 1850) - (CERITHIIDAE)
- attenuatum, Rhinoclavis attenuatum R.A. Philippi, 1848 - syn of: Rhinoclavis longicaudata (A. Adams & L.A. Reeve, 1850) - (CERITHIIDAE)
- attenuatum, Chaetoderma attenuatum H. Heath, 1911 - syn of: Chaetoderma argenteum H. Heath, 1911 - (CHAETODERMATIDAE)
- attenuatum, Conocardium attenuatum T.A. Conrad, 1840 † - syn of: Hispidofusus senticosus (R. Tate, 1888 †) - (CONOCARDIIDAE) (FOSSIL)
- attenuatum, Dentalium attenuatum T. Say, 1824 † - (DENTALIIDAE) (FOSSIL)
- attenuatum, Dentalium attenuatum G.B. Sowerby, 1860 - syn of: Gadilina pachypleura (M. Boissevain, 1906) - (DENTALIIDAE)
- attenuatum, Aphetoceras attenuatum A. Hyatt, 1894 † - (ESTONIOCERATIDAE) (FOSSIL)
- attenuatum, Aliculastrum attenuatum J. de C. Sowerby, † - (HAMINOEIDAE) (FOSSIL)
- attenuatum, Glottoceras attenuatum A. Hyatt, 1875 † - (KNEMICERATIDAE) (FOSSIL)
- attenuatum, Myloceras serotinum attenuatum M. Collignon, 1951 † - (LABECERATIDAE) (FOSSIL)
- attenuatum, Prunum attenuatum L.A. Reeve, 1865 - syn of: Volvarina attenuata (L.A. Reeve, 1865) - (MARGINELLIDAE)
- attenuatum, Nostoceras attenuatum Brunnschweiler, 1966 † - (NOSTOCERATIDAE) (FOSSIL)
- attenuatum, Platyceras attenuatum J.W. Hall, 1859 † - (PLATYCERATIDAE) (FOSSIL)
- attenuatum, Pleuronodoceras attenuatum J.K. Zhao & al., 1978 † - (PLEURONODOCERATIDAE) (FOSSIL)
- attenuatum, Pentagonoceras attenuatum J.K. Zhao & al., 1978 † - (PLEURONODOCERATIDAE) (FOSSIL)
- attenuatum, Pleurotoma attenuatum G. Montagu, 1803 - syn of: Mangelia attenuata (G. Montagu, 1803) - (TURRIDAE)
- attenuatum, Cylindrella attenuatum L. Pfeiffer, 1856 - syn of: Coelocentrum tomacella attenuatum (L. Pfeiffer, 1856) - (UROCOPTIDAE)
- attenuatum, Coelocentrum tomacella attenuatum (L. Pfeiffer, 1856) - (UROCOPTIDAE)
- attenuatum boreale, Lirobittium attenuatum boreale P. Bartsch, 1911 - (CERITHIIDAE)
- attenuatum brevicandatum, Rhinoclavis attenuatum brevicandatum N.H. Odhner, 1917 - syn of: Rhinoclavis articulata (A. Adams & L.A. Reeve, 1850) - (CERITHIIDAE)
- attenuatum tenuicosta, Pleurotoma attenuatum tenuicosta G.A. Brugnone, 1862 - syn of: Mangelia tenuicosta (G.A. Brugnone, 1862) - (TURRIDAE)
- attenuatus, Tornatellides attenuatus C.M. Cooke & H.A. Pilsbry, 1915 - (ACHATINELLIDAE)
- attenuatus, Habevolutopsius attenuatus (W.H. Dall, 1874) - (BUCCINIDAE)
- attenuatus, Aeneator attenuatus A.W.B. Powell, 1927 - (BUCCINIDAE)
- attenuatus, Retifusus attenuatus (A.N. Golikov & V.V. Gulbin, 1977) - (BUCCINIDAE)
- attenuatus, Plicifusus attenuatus A.N. Golikov & V.V. Gulbin, 1977 - syn of: Retifusus attenuatus (A.N. Golikov & V.V. Gulbin, 1977) - (BUCCINIDAE)
- attenuatus, Mesembrinus attenuatus L. Pfeiffer, 1853 - (BULIMULIDAE)
- attenuatus, Attenuiconus attenuatus (L.A. Reeve, 1844) - (CONIDAE)
- attenuatus, Dauciconus attenuatus L.A. Reeve, 1844 - syn of: Attenuiconus attenuatus (L.A. Reeve, 1844) - (CONIDAE)
- attenuatus, Dactylioceras attenuatus C.T. Simpson, 1855 † - (DACTYLIOCERATIDAE) (FOSSIL)
- attenuatus, Chondrus attenuatus I. Krynicki, 1833 - syn of: Brephulopsis bidens attenuatus (I. Krynicki, 1836) - (ENIDAE)
- attenuatus, Brephulopsis bidens attenuatus (I. Krynicki, 1836) - (ENIDAE)
- attenuatus, Exilifusus attenuatus (R.A. Philippi, 1846 †) - (FASCIOLARIIDAE) (FOSSIL)
- attenuatus, Pustulatirus attenuatus (L.A. Reeve, 1847) - (FASCIOLARIIDAE)
- attenuatus, Fusus attenuatus J.G. Jeffreys, 1877 - syn of: Colus jeffreysianus (P. Fischer, 1868) - (FASCIOLARIIDAE)
- attenuatus, Cadulus attenuatus T.A. de M. Monterosato, 1875 - (GADILIDAE)
- attenuatus, Episiphon attenuatus G.B. Sowerby, 1860 - syn of: Gadilina pachypleura (M. Boissevain, 1906) - (GADILINIDAE)
- attenuatus, Graphoceras attenuatus (Buckman, 1901 †) - (GRAPHOCERATIDAE) (FOSSIL)
- attenuatus, Hamites attenuatus (Sowerby, 1814 †) - (HAMITIDAE) (FOSSIL)
- attenuatus, Permophorus attenuatus Sayre † - (KALENTERIDAE) (FOSSIL)
- attenuatus, Daixites attenuatus Ruzhentsev, 1952 † - (MEDLICOTTIIDAE) (FOSSIL)
- attenuatus, Murex attenuatus G. Montagu, 1803 - syn of: Mangelia attenuata (G. Montagu, 1803) - (MURICIDAE)
- attenuatus, Nelegerocornus attenuatus Meshkova, 1974 † - (NELEGEROCORNIDAE) (FOSSIL)
- attenuatus, Karakaschiceras attenuatus (Behrendsen, 1892 †) - (NEOCOMITIDAE) (FOSSIL)
- attenuatus, Oxymelania vallesensis attenuatus H.A. Pilsbry & A. Hinkley, 1910 - (PACHYCHILIDAE)
- attenuatus, Palaeostylus attenuatus A. Nützel & Nakazawa, 2012 † - (PALAEOSTYLIDAE) (FOSSIL)
- attenuatus, Pernopecten attenuatus Herrick, 1887 † - (PERNOPECTINIDAE) (FOSSIL)
- attenuatus, Cultellus attenuatus R.W. Dunker, 1862 - (PHARIDAE)
- attenuatus, Scaphander attenuatus M.M. Schepman, 1913 - syn of: Meloscaphander sibogae M.M. Schepman, 1913 - (SCAPHANDRIDAE)
- attenuatus, Subulites attenuatus Lindström, 1884 † - (SUBULITIDAE) (FOSSIL)
- attenuatus, Tornus attenuatus E. Rolán & F. Rubio, 2002 - (TORNIDAE)
- attenuatus, Seilarex attenuatus C. Hedley, 1900 - syn of: Seilarex turritelliformis (G.F. Angas, 1877) - (TRIPHORIDAE)
- attenuatus, Tosatrochus attenuatus (I.H. Jonas, 1844) - (TROCHIDAE)
- attenuatus, Trochus attenuatus I.H. Jonas, 1844 - syn of: Tosatrochus attenuatus (I.H. Jonas, 1844) - (TROCHIDAE)
- attenuatus, Diplosolenodes attenuatus (G. Colosi, 1925) - (VERONICELLIDAE)
- attenuatus pittieri, Mesembrinus attenuatus pittieri E.C. Von Martens, 1893 - (BULIMULIDAE)
- attenuatus rogersi, Lithophaga attenuatus rogersi S.S. Berry, 1957 - syn of: Solamen attenuata (G.P. Deshayes, 1836) - (MYTILIDAE)
- attenuatus varicosus, Mesembrinus attenuatus varicosus (L. Pfeiffer, 1851) - (BULIMULIDAE)
- Attenuiconus, Genus Attenuiconus E.J. Petuch, 2013 (CONIDAE)
- attenuissima, Seila attenuissima P. Marshall & R. Murdoch, 1920 † - (CERITHIOPSIDAE) (FOSSIL)
- Atthila, Genus Atthila L.S.R. Bergh, 1899 (ARMINIDAE)
- attiai, Pleiodon attiai (Cox, 1955 †) - (IRIDINIDAE) (FOSSIL)
- attiai, Unio attiai Cox, 1955 † - syn of: Pleiodon attiai (Cox, 1955 †) - (UNIONIDAE) (FOSSIL)
- Attica, syn of: Genus Macedonica O. Bφttger, 1877 (CLAUSILIIDAE)
- attica, Prososthenia attica (A. Fuchs, 1877 †) - (HYDROBIIDAE) (FOSSIL)
- attica, Cernuella attica O. Böttger, 1883 - syn of: Cernuella virgata (E.M. Da Costa, 1778) - (HYGROMIIDAE)
- attica, Radix attica J.R. Roth, 1855 - syn of: Radix balthica (C. Linnaeus, 1758) - (LYMNAEIDAE)
- atticae, Asthenotoma atticae F. Nordsieck, 1977 - syn of: Asthenotoma ornata atticae (F. Nordsieck, 1977) - (BORSONIIDAE)
- atticae, Asthenotoma ornata atticae (F. Nordsieck, 1977) - (BORSONIIDAE)
- atticae, Fehria atticae F. Nordsieck, 1977 - syn of: Asthenotoma ornata atticae (F. Nordsieck, 1977) - (MANGELIIDAE)
- atticum, Bittium atticum F. Nordsieck, 1977 - syn of: Bittium reticulatum (E.M. Da Costa, 1778) - (CERITHIIDAE)
- atticus, Pericleites atticus Renz, 1910 † - (AGATHICERATIDAE) (FOSSIL)
- atticus, Jaminia atticus C.A. Westerlund, 1887 - syn of: Jaminia quadridens (O.F. Müller, 1774) - (ENIDAE)
- atticus, Theodoxus atticus Kühn, 1963 † - (NERITIDAE) (FOSSIL)
- atticus, Oxfordoceras atticus (Billings, 1865 †) - (ORTHOCERATIDAE) (FOSSIL)
- atticus, Planorbis atticus J.R. Bourguignat, 1852 - (PLANORBIDAE)
- atticus, Buttsoceras atticus (Billings, 1865 †) - (TROEDSSONELLIDAE) (FOSSIL)
- attila, Neoprotrachyceras attila (Mojsisovics, 1893 †) - (TRACHYCERATIDAE) (FOSSIL)
- attilae, Schileykula attilae B. Páll-Gergely, 2010 - (ORCULIDAE)
- attilatomasi, Pteria attilatomasi O. Macsotay & B. Campos, 2001 - syn of: Pteria venezuelensis (R.W. Dunker, 1872) - (PTERIIDAE)
- attilioi, Niso attilioi (C.M. Hertz & C.M. Hertz, 1982) - (EULIMIDAE)
- Attiliosa, Genus Attiliosa W.K. Emerson, 1968 (MURICIDAE)
- attleborensis, Aldanella attleborensis (Shaler & Foerste, 1888 †) - (ALDANELLIDAE) (FOSSIL)
- attleborensis, Bemella attleborensis (Shaler & Foerste, 1888 †) - (HELCIONELLIDAE) (FOSSIL)
- attonitum, Granicorium attonitum T. Iredale, 1936 - syn of: Granicorium indutum C. Hedley, 1906 - (VENERIDAE)
- attonsa, Cylichna attonsa P.P. Carpenter, 1865 - (CYLICHNIDAE)
- attra, Pareuthria attra F.A. Schilder & M. Schilder, 1938 - (BUCCINIDAE)
- attracta, Canalicia attracta (O. Böttger, 1870 †) - (CLAUSILIIDAE) (FOSSIL)
- attracta, Ludwigella attracta Buckman, 1904 † - syn of: Graphoceras attractum (Buckman, 1904 †) - (GRAPHOCERATIDAE) (FOSSIL)
- attractum, Graphoceras attractum (Buckman, 1904 †) - (GRAPHOCERATIDAE) (FOSSIL)
- attrahens, Brechites attrahens (J. Lightfoot, 1786) - (PENICILLIDAE)
- attrahens australis, Brechites attrahens australis J.C. Chenu, 1843 - syn of: Brechites australis J.C. Chenu, 1843 - (PENICILLIDAE)
- attramentaria, Batillaria attramentaria (A. Adams in G.B. II Sowerby, 1865) - (BATILLARIIDAE)
- attramentarium, Cerithium attramentarium A. Adams in G.B. II Sowerby, 1865 - syn of: Batillaria attramentaria (A. Adams in G.B. II Sowerby, 1865) - (CERITHIIDAE)
- attrina, Calliostoma attrina W.C. Mansfield, 1925 † - (CALLIOSTOMATIDAE) (FOSSIL)
- attrita, Abida attrita A. Moquin-Tandon, 1856 - syn of: Abida polyodon (J.P.R. Draparnaud, 1801) - (CHONDRINIDAE)
- attrita, Pinguiphaedusa attrita (O. Böttger, 1877) - (CLAUSILIIDAE)
- attrita, Discula attrita (R.T. Lowe, 1831) - (HYGROMIIDAE)
- attrita, Turbonilla attrita W.H. Dall & P. Bartsch, 1909 - (PYRAMIDELLIDAE)
- attrita, Sonninia attrita Buckman † - (SONNINIIDAE) (FOSSIL)
- attrita infausta, Pinguiphaedusa attrita infausta (H.A. Pilsbry, 1902) - (CLAUSILIIDAE)
- attrita keizii, Pinguiphaedusa attrita keizii (T. Habe, 1943) - (CLAUSILIIDAE)
- attritum, Cerithium attritum W.H. Hudleston, 1889 † - (CERITHIIDAE) (FOSSIL)
- attrochus, Trochus attrochus Hudleston † - (TROCHIDAE) (FOSSIL)
- attrox, Lithancylus attrox (F.M. Anderson, 1938 †) - (ANCYLOCERATIDAE) (FOSSIL)
- attuensis, Tripoplax attuensis (K.B. Clark, 2000) - (ISCHNOCHITONIDAE)
- atuberculatum, Librovitschiceras atuberculatum (Tzwetaev, 1888 †) - (AIPOCERATIDAE) (FOSSIL)
- atuberculatus, Nautilus atuberculatus Tzwetaev, 1888 † - syn of: Librovitschiceras atuberculatum (Tzwetaev, 1888 †) - (NAUTILIDAE) (FOSSIL)
- atuca, Hydrobia atuca H.D. Boeters, 1988 - syn of: Ecrobia ventrosa (G. Montagu, 1803) - (HYDROBIIDAE)
- atuelensis, Chartronella atuelensis Ferrari, 2014 † - (PARATURBINIDAE) (FOSSIL)
- atuelensis, Striactaeonina atuelensis J. Gründel, 2001 † - (TUBIFERIDAE) (FOSSIL)
- aturensis, Bythinia aturensis Noulet, 1854 † - syn of: Hydrobia aturensis (Noulet, 1854 †) - (AMNICOLIDAE) (FOSSIL)
- aturensis, Zonarina aturensis L. Dolin & P. Lozouet, 2004 † - (CYPRAEIDAE) (FOSSIL)
- aturensis, Fustiaria aturensis A.E.M. Cossmann & M.A. Peyrot, 1916 † - (FUSTIARIIDAE) (FOSSIL)
- aturensis, Hydrobia aturensis (Noulet, 1854 †) - (HYDROBIIDAE) (FOSSIL)
- aturensis, Erycina aturensis A.E.M. Cossmann & M.A. Peyrot, 1911 † - (LASAEIDAE) (FOSSIL)
- aturensis, Pholadomya puschi aturensis A.E.M. Cossmann & M.A. Peyrot, 1909 † - (PHOLADOMYIDAE) (FOSSIL)
- aturensis, Alvania aturensis P. Lozouet, 1998 † - (RISSOIDAE) (FOSSIL)
- aturensis, Rissoina aturensis A.E.M. Cossmann & M.A. Peyrot, 1919 † - (RISSOINIDAE) (FOSSIL)
- aturensis, Hastulopsis pseudopertusa aturensis (M.A. Peyrot, 1932 †) - (TEREBRIDAE) (FOSSIL)
- aturensis, Megalomphalus aturensis (A.E.M. Cossmann & M.A. Peyrot, 1919 †) - (VANIKORIDAE) (FOSSIL)
- aturi, Aturia aturi (B. de Basterot, 1825 †) - (ATURIIDAE) (FOSSIL)
- aturi, Sunetta aturi (C. Mayer, 1858 †) - (VENERIDAE) (FOSSIL)
- Aturia, Genus Aturia Bronn, 1838 (ATURIIDAE) (FOSSIL)
- aturicus, Unio aturicus É.A.A. Locard, 1889 - syn of: Unio arcuatus N.R. Bouchard-Chantereaux, 1838 - (UNIONIDAE)
- ATURIIDAE Hyatt, 1894 - Family (CEPHALOPODA-NAUTILOIDEA-NAUTILIDA) (FOSSIL)
- Aturoidea, Genus Aturoidea Vredenburg, 1925 (HERCOGLOSSIDAE) (FOSSIL)
- aturoides, Pseudonautilus aturoides (Pictet, 1866 †) - (PSEUDONAUTILIDAE) (FOSSIL)
- atwoodae, Gibberula atwoodae J.A. Ortea, 2015 - (CYSTISCIDAE)
- atwoodi, Teredothyra atwoodi P. Bartsch, 1923 - syn of: Teredothyra dominicensis (P. Bartsch, 1921) - (TEREDINIDAE)
- atwoodii, Ostrea atwoodii W.M. Gabb, 1866 † - (OSTREIDAE) (FOSSIL)
- ATYDIDAE - syn of Family: HAMINOEIDAE
- ATYIDAE - syn of Family: HAMINOEIDAE
- atyoides, Sphaerocylichna atyoides (K.H.J. Thiele, 1925) - (CYLICHNIDAE)
- atypha, Cetoconcha atypha A.E. Verrill & K.J. Bush, 1898 - (CETOCONCHIDAE)
- atypha, Jorunna atypha L.S.R. Bergh, 1881 - (DISCODORIDIDAE)
- atypha, Eulima atypha A.E. Verrill & K.J. Bush, 1900 - (EULIMIDAE)
- atypha, Natica buriasiensis atypha R.B. Watson, 1881 - (NATICIDAE)
- atypha, Turbonilla atypha K.J. Bush, 1899 - (PYRAMIDELLIDAE)
- atypha, Gymnobela atypha (K.J. Bush, 1893) - (RAPHITOMIDAE)
- atyphus, Littorina atyphus R.E.C. Stearns, 1892 - syn of: Echinolittorina lemniscata (R.A. Philippi, 1846) - (LITTORINIDAE)
- atypica, Conjectura atypica A.W.B. Powell, 1937 - syn of: Acremodontina atypica (A.W.B. Powell, 1937) - (CROSSEOLIDAE)
- atypica, Doris atypica (C.N.E. Eliot, 1906) - (DORIDIDAE)
- atypica, Chlamylla atypica (L.S.R. Bergh, 1899) - (FLABELLINIDAE)
- atypica, Goniaeolis atypica (L.S.R. Bergh, 1900) - (GONIAEOLIDIDAE)
- atypica, Limacina atypica (C.R. Laws, 1944 †) - (LIMACINIDAE) (FOSSIL)
- atypica, Purella atypica Missarzhevsky, 1980 † - (MAIKHANELLIDAE) (FOSSIL)
- atypica, Mitrolumna atypica P. Lozouet, 2015 - (MITROMORPHIDAE)
- atypica, Eustreptostyla nicoleti atypica H.B. Baker, 1941 - (SPIRAXIDAE)
- atypica, Trochaclis atypica (C.R. Laws, 1939 †) - (TROCHACLIDIDAE) (FOSSIL)
- atypica, Acremodontina atypica (A.W.B. Powell, 1937) - (TROCHACLIDIDAE)
- atypicum, Domatoceras atypicum Shimansky, 1965 † - (GRYPOCERATIDAE) (FOSSIL)
- atypicus, Clanculus atypicus (T. Iredale, 1912) - (TROCHIDAE)
- atypicus, Clanculopsis atypicus T. Iredale, 1912 - syn of: Clanculus atypicus (T. Iredale, 1912) - (TROCHIDAE)
- atypikos, Bythinella atypikos A. Reischütz, P.L. Reischütz & W. Fischer, 2008 - (BYTHINELLIDAE)
- Atys, Genus Atys P.D. Montfort, 1810 (HAMINOEIDAE)
- atys, Atys atys J.F. Gmelin, 1791 - syn of: Atys naucum (C. Linnaeus, 1758) - (HAMINOEIDAE)
- Atyscaphander, syn of: Genus Bullacta L.S.R. Bergh, 1901 (HAMINOEIDAE)
- aualites, Arctostrea aualites Stefanini, 1925 † - syn of: Eligmus aualites (Stefanini, 1925 †) - (ARCTOSTREIDAE) (FOSSIL)
- aualites, Eligmus aualites (Stefanini, 1925 †) - (MALLEIDAE) (FOSSIL)
- auarita, Stiliger auarita G.M. Caballer, J.A. Ortea & L. Moro, 2009 - (LIMAPONTIIDAE)
- auaua, Limaria auaua (W.H. Dall, P. Bartsch & H.A. Rehder, 1938) - (LIMIDAE)
- aubentonensis, Scurriopsis aubentonensis (d'Archiac, 1843 †) - (ACMAEIDAE) (FOSSIL)
- auberi, Cysticopsis auberi (A.V.M.D. D'Orbigny, 1842) - (CEPOLIDAE)
- auberi, Amalda auberi A.L. Chavan, 1965 † - (OLIVIDAE) (FOSSIL)
- auberiana, Assiminea auberiana Auct. non D'Orbigny, 1842 - syn of: Assiminea succinea (L. Pfeiffer, 1840) - (ASSIMINEIDAE)
- auberiana, Assiminea auberiana D'Orbigny, 1842 - syn of: Alvania auberiana (A.V.M.D. D'Orbigny, 1842) - (ASSIMINEIDAE)
- auberiana, Hydrobia auberiana D'Orbigny, 1842 - syn of: Alvania auberiana (A.V.M.D. D'Orbigny, 1842) - (HYDROBIIDAE)
- auberiana, Ithycythara auberiana (A.V.M.D. D'Orbigny, 1847) - (MANGELIIDAE)
- auberiana, Alvania auberiana (A.V.M.D. D'Orbigny, 1842) - (RISSOIDAE)
- auberiana, Poeycoptis auberiana (A.V.M.D. D'Orbigny, 1842) - (UROCOPTIDAE)
- auberiana, Anomalocardia auberiana D'Orbigny, 1842 - syn of: Anomalocardia puella (Pfeiffer in R.A. Philippi, 1846) - (VENERIDAE)
- auberiana, Venus auberiana D'Orbigny, 1853 - syn of: Anomalocardia puella (Pfeiffer in R.A. Philippi, 1846) - (VENERIDAE)
- auberianum, Chondropoma auberianum (A.V.M.D. D'Orbigny, 1842) - (POMATIIDAE)
- auberianum mayense, Chondropoma auberianum mayense C. de la Torre & P. Bartsch, 1938 - (POMATIIDAE)
- auberii, Cylichna auberii (A.V.M.D. D'Orbigny, 1841) - (CYLICHNIDAE)
- aubertdelaruei, Pseudolibera aubertdelaruei A.F. Sartori, O. Gargominy & Fontaine, 2014 - (ENDODONTIDAE)
- auberti, Drillia auberti É. Lamy, 1934 - syn of: Pilsbryspira auberti (É. Lamy, 1934) - (DRILLIIDAE)
- auberti, Nassa auberti R. Abrard, 1946 - syn of: Nassarius novaezelandiae (L.A. Reeve, 1854) - (NASSARIIDAE)
- auberti, Pilsbryspira auberti (É. Lamy, 1934) - (PSEUDOMELATOMIDAE)
- auberti, Trapezium auberti R. Abrard, 1942 † - (TRAPEZIDAE) (FOSSIL)
- auberti, Dosinia auberti E. Fischer-Piette & D. Delmas, 1967 - (VENERIDAE)
- aubiniana, Clausilia aubiniana J.R. Bourguignat, 1869 - syn of: Clausilia bidentata crenulata A. Risso, 1826 - (CLAUSILIIDAE)
- aubrechti, Acteon aubrechti M. Harzhauser, 2014 † - (ACTEONIDAE) (FOSSIL)
- aubreyi, Anodonta aubreyi H.B. Preston, 1912 - syn of: Sinanodonta woodiana (I. Lea, 1834) - (UNIONIDAE)
- aubryana, Aegista aubryana P.M. Heude, 1882 - (BRADYBAENIDAE)
- aubryana, Clathurella aubryana (R.P.J. Hervier, 1896) - (CLATHURELLIDAE)
- aubryana, Costellaria aubryana R.P.J. Hervier, 1898 - syn of: Pusia fortiplicatum (W.H. Pease, 1868) - (COSTELLARIIDAE)
- aubryana, Propustularia aubryana F.P. Jousseaume, 1869 - syn of: Propustularia surinamensis (Perry, 1811) - (CYPRAEIDAE)
- aubryana, Cipangopaludina aubryana (P.M. Heude, 1890) - (VIVIPARIDAE)
- aubryi, Thala aubryi H. Turner, S. Gori & R. Salisbury, 2007 - (COSTELLARIIDAE)
- aubryi, Eopecten aubryi G.A. Goldfuss, 1833 † - syn of: Eopecten velatus (G.A. Goldfuss, 1833 †) - (PECTINIDAE) (FOSSIL)
- aubryi, Pholadomya aubryi Douville, 1886 † - (PHOLADOMYIDAE) (FOSSIL)
- aubryi, Pleuronectites aubryi Douville, 1886 † - syn of: Eopecten velatus (G.A. Goldfuss, 1833 †) - (PLEURONECTITIDAE) (FOSSIL)
- aubryi, Anodonta aubryi P.M. Heude, 1881 - syn of: Sinanodonta woodiana (I. Lea, 1834) - (UNIONIDAE)
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